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Erasers are made from either natural or synthetic rubber. Natural rubber is produced from latex that is collected from rubber trees. Water is removed from the latex, increasing the rubber content to 60%. Acid is added to the liquid concentrate in order to produce solid sheets of dry rubber.
Kneaded erasers are also useful for making impromptu sculptures to sketch from. Kneaded erasers are mostly used for slightly erasing but not fully erasing the content of graphite. It has great plasticity and can be molded and shaped into desired forms for ease of usage.neaded erasers are also useful for making impromptu sculptures to sketch from. Kneaded erasers are mostly used for slightly erasing but not fully erasing the content of graphite. It has great plasticity and can be molded and shaped into desired forms for ease of usage.